King Arthur's Brain Bender...

Or at least that's how it reads to me.... Ready to play?? Here we go!!

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What do the following words have in common?

• KNIFE
• THUMB
• SWORD
• HIGH

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See?

Sir Firebrandt tested the sharpness of the knife on his thumb and returned it to it's sheath before bringing his sword up in a high arc ready to do battle.

Anyway, the answers will be found in the comments later. Cheerio!

Update: Friend and reader (and official smartypants) Rich Blank was first in with today's answer. Whoohoo!